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mOj s I TKDA TOLTZ, KING, DUVALL, ANDERSON AND ASSOCIATES, INCORPORATED ENGINEERS • ARCHITECTS • PLANNERS 1500 PIPERJAFFRAV PLAZA 444 CEDAR STREET SAINT PAUL, MINNESOTA 55101-2140 PHONE:612,02-4400 FAX:61MQ2-0063 May 15, 1995 Honorable Mayor and City Council Lake Elmo, Minnesota Re: 36th Street/37th Street Drainage Lake Elmo, Minnesota Commission No. 9150-950 Dear Mayor and City Council: As you are aware, there has been an ongoing drainage problem in the 36th Street, 37th Street and Irwin Avenue area. The problem stems from the fact that there is no overland outlet for the water. In the spring, and during heavy rains, ponded water will flood the basements and septic systems of the Boche house on 37th Street, and the Strege house on 36th Street. On Friday, May 5 we met with the neighborhood residents to discuss the problem and possible solutions. It appears that there are 3 separate problems which need attention. The first problem, that there is -no outlet to the area, is addressed by the construction of a new culvert. This culvert would run from the Valley Branch Watershed District's manhole in the intersection of 36th Street and Irwin Avenue to the ditch on the north side of 36th Street. Some minor ditching is also necessary along 36th street. This solution was approved by the VBWD and is included as a project in our 1995 overlays, The cost of this work was bid at $3,500. The second problem area was noted by Mr. Boche on his property. Water will drain from the culvert crossing 37th Street to the new culvert on 36th Street only after ponding on his property. There is a high spot across his yard which prevents flow between the culverts. This high spot occurs over his drainfield, and may have been caused by fill being placed over the field when it was built in 1975. In any event, water stands on his property up to 1.2' depth. It is not feasible to grade his property to drain because of the shallow drainfield lines. Two solutions are possible: A. Construct a storm sewer pipe from the low point on 37th Street to the Valley Branch manhole north of 37th Street. Estimated cost of this improvement is $10,000. B. Replace Mr. Boche's drainfield with a mound, and grade Mr. Boche's and Mr. Strege's yards to drain. If the City wishes to correct this problem, we recommend solution A, since it involves no work on private property.